i currently use a heater for 25 +/- 1 degrees celcius. and a filter. noob question: tank with filter= cycle?
anyways my tank is 2gallon...and only my betta is living in it. i am wondering if i can maybe put some shrimp or any bottom dwelling fishs of 3 or so along with Ducky(betta)...

i know that shrimp eat the nasty algae and all taht stuff...will filter affect it if shrimp is a possible addition to the tank??

Ammonia will spike and die down, and nitrites will form.
Nitrites will spike and die down, and nitrates will form.
Nitrates will spike, and die down to about 5-20ppm. Then the cycle is complete. Ammonia/Nitrite needs to be at 0ppm all the time.

Since you already have a fish it will create the ammonia from its waste. I cant remember where nitrites come from but I think its when the benificial bacteria eating the ammonia. Then the bacteria turns the nitrite into nitrate.

You dont need to buy any equipment, all you can really do is test the water to make sure it doesnt get to bad and change the water at the right times(which you'll have to ask someone else for because idk). Also since it is a 2g tank some people will say it cant really cycle anyway, but basically make sure your tank is well established before you put more shrimp/fish in.

I have a 2-gallon tank also. It has a light, filter, live plant, and gravel. I was thinking of 1 or 2 small fish to go in with my male betta. I know nothing about fish, including names. I would like something colorful. I saw some pretty fish at the store that are small and bright yellow. I like all colors.